<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>01-HelloWorld</title>
    <script src="jq/jquery-3.4.1.js"></script>
    <script>
        //原生JS
        //window.onload=function(ev){}
        //jQuery
        $(document).ready(function(){
            alert("Hello World!");
        });
    </script>
</head>
<body>
</body>
</html>
